CompatHelper: bump compat for SpecialFunctions to 2, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the SpecialFunctions package from 0.7, 0.8, 0.9, 0.10, 1.0 to 0.7, 0.8, 0.9, 0.10, 1.0, 2.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.

[ranocha]

It would be nice to get this merged to allow downstream packages to upgrade. A first search indicates that the only breaking change in SpecialFunctions.jl was to remove some method Base.factorial for general number types, see JuliaMath/SpecialFunctions.jl#297 and JuliaMath/SpecialFunctions.jl#361. This package shouldn't be affected directly since there does not seem to be any factorial in here, see https://github.com/JuliaApproximation/FastGaussQuadrature.jl/search?q=factorial&type=code
I wonder why no CI is triggered automatically...

[dlfivefifty]

CompatHelper for some reason never triggers tests. modifying the branch by bumping the version triggers the tests, once they pass I can merge and tag

[dlfivefifty]

PS I recommend not worrying about being on the latest version unless there is some feature you absolutely need. A change like this will take weeks to filter down.

[codecov]

Codecov Report

Merging #104 (2791780) into master (e8b1e80) will decrease coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #104      +/-   ##
==========================================
- Coverage   97.04%   96.96%   -0.08%     
==========================================
  Files           9        8       -1     
  Lines        1149     1154       +5     
==========================================
+ Hits         1115     1119       +4     
- Misses         34       35       +1     

Impacted Files	Coverage Δ
src/gausslaguerre.jl	92.69% <0.00%> (-0.25%)	⬇️
src/FastGaussQuadrature.jl
src/gaussjacobi.jl	99.26% <0.00%> (+<0.01%)	⬆️
src/gausslegendre.jl	98.73% <0.00%> (+<0.01%)	⬆️
src/besselroots.jl	96.12% <0.00%> (+0.06%)	⬆️

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